adding hidden basic asp.net core backend (#30)

Base functionality:

    DB
    email sending
    user registration & login
    storing new characters and reading them back

Notes:

    Functionality is "hidden" with no links pointing to it.
    Most pages are scaffolded and not reviewed at all :(
    local Dev db setup is pushed to git
    NO local email setup :(

Kemkas.Web/.config/dotnet-tools.json

@@ -0,0 +1,18 @@
+{
+  "version": 1,
+  "isRoot": true,
+  "tools": {
+    "dotnet-aspnet-codegenerator": {
+      "version": "8.0.0",
+      "commands": [
+        "dotnet-aspnet-codegenerator"
+      ]
+    },
+    "dotnet-ef": {
+      "version": "8.0.0",
+      "commands": [
+        "dotnet-ef"
+      ]
+    }
+  }
+}